Home / 20,870.90-28,831.51-16,831.79

Finding the Fourth Proportional to 20,870.90, 28,831.51 and 16,831.79

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Solution

The fourth proportional to 20,870.90, 28,831.51 and 16,831.79 is: 23,251.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.90 : 28,831.51 = 16,831.79 : x
  2. Step 2: Convert to fraction form
    20,870.90/28,831.51 = 16,831.79/x
  3. Step 3: Cross multiply
    20,870.90x = 28,831.51 × 16,831.79
  4. Step 4: Simplify right side
    20,870.90x = 485,285,921.70
  5. Step 5: Solve for x
    x = 485,285,921.70/20,870.90
  6. Step 6: Final answer
    x = 23,251.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.